Boyle became famous overnight after her audition for "Britain's Got Talent" in 2009 amazed people around the world who saw it on the show and on the Internet,

Asperger's syndrome, a developmental disorder that is a form of autism, is characterized by poor social skills, physical clumsiness, and narrowly focused interests, according to the U.S. National Institutes of Health.

Boyle, 52, said she hoped revealing her Asperger's diagnosis will lead people to understand and treat her better. She said it was important for her to have a support team.

"I am not strong on my own. When I have the support of people around me I am fine," she said.

Boyle recently released her fifth studio album, a collection of Christmas recordings. Her debut album, "I Dreamed a Dream," sold more than 8 million copies around the world, making it the most popular album of 2009.